/**
 * @file crc.c
 * @brief
 * @author xuesong (wenshaoliu@foxmail.com)
 * @version 1.0
 * @date 2024-08-21
 *
 * @copyright Copyright (c) 2024  by xuesong
 *
 * @par 修改日志:
 * <table>
 * <tr><th>Date       <th>Version <th>Author  <th>Description
 * <tr><td>2024-08-21     <td>1.0     <td>xuesong   <td>内容
 * </table>
 */

#include "crc.h"
//--------------------------------------------------
#define pvPortMalloc malloc
#define vPortFree free
#define LOG(...) printf(__VA_ARGS__)
//--------------------------------------------------

void InvertUint8(unsigned char *dBuf, unsigned char *srcBuf)
{
    int i;
    unsigned char tmp[4];
    tmp[0] = 0;
    for (i = 0; i < 8; i++)
    {
        if (srcBuf[0] & (1 << i))
            tmp[0] |= 1 << (7 - i);
    }
    dBuf[0] = tmp[0];
}

void InvertUint16(unsigned short *dBuf, unsigned short *srcBuf)
{
    int i;
    unsigned short tmp[4];
    tmp[0] = 0;
    for (i = 0; i < 16; i++)
    {
        if (srcBuf[0] & (1 << i))
            tmp[0] |= 1 << (15 - i);
    }
    dBuf[0] = tmp[0];
}

void InvertUint32(unsigned int *dBuf, unsigned int *srcBuf)
{
    int i;
    unsigned int tmp[4];

    tmp[0] = 0;

    for (i = 0; i < 32; i++)
    {
        if (srcBuf[0] & (1 << i))
            tmp[0] |= 1 << (15 - i);
    }
    dBuf[0] = tmp[0];
}
//--------------------------------------------------
// CRC-8 x8+x2+x+1
//  #define CRC_POLY   0x107
// CRC-8 x8+x5+x4+1
#define CRC8_POLY 0x131
unsigned char crc8_seed(unsigned char seed, unsigned char *vptr, unsigned char len)
{
    const unsigned char *data = vptr;
    unsigned crc = seed;
    int i, j;
    for (j = len; j; j--, data++)
    {
        crc ^= (*data << 8);
        for (i = 8; i; i--)
        {
            if (crc & 0x8000)
                crc ^= (CRC8_POLY << 11);
            crc <<= 1;
        }
    }
    return (unsigned char)(crc >> 8);
}

unsigned char crc8_high_first(unsigned char seed, unsigned char *ptr, unsigned char len)
{
    unsigned char i;
    unsigned char crc = seed; /* 计算的初始crc值 */
    while (len--)
    {
        crc ^= *ptr++;          /* 每次先与需要计算的数据异或,计算完指向下一数据 */
        for (i = 8; i > 0; --i) /* 下面这段计算过程与计算一个字节crc一样 */
        {
            if (crc & 0x80)
                crc = (crc << 1) ^ (CRC8_POLY & 0xFF);
            else
                crc = (crc << 1);
        }
    }
    return (crc);
}
//----------------Haier CRC16----------------------------------
uint16_t const crc16_table[256] = {
    0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
    0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
    0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
    0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
    0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
    0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
    0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
    0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
    0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
    0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
    0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
    0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
    0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
    0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
    0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
    0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
    0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
    0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
    0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
    0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
    0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
    0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
    0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
    0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
    0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
    0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
    0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
    0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
    0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
    0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
    0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
    0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040};

static uint16_t HaierCrc16_byte(uint16_t crc, const uint8_t data)
{
    return (crc >> 8) ^ crc16_table[(crc ^ data) & 0xff];
}

uint16_t HaierCrc16(uint16_t crc, uint8_t const *buffer, uint32_t len)
{
    while (len--)
        crc = HaierCrc16_byte(crc, *buffer++);
    return crc;
}

//---------------- CRC16 ModBus----------------------------------
static uint16_t ModBusCrc16_byte(uint16_t crc, uint8_t byte)
{
    static const uint16_t crc16_table[16] =
        {
            0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
            0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400};

    uint16_t temp;

    // Compute checksum of lower four bits of a byte.
    temp = crc16_table[crc & 0xF];
    crc = (crc >> 4u) & 0x0FFFu;
    crc = crc ^ temp ^ crc16_table[byte & 0xF];

    // Now compute checksum of upper four bits of a byte.
    temp = crc16_table[crc & 0xF];
    crc = (crc >> 4u) & 0x0FFFu;
    crc = crc ^ temp ^ crc16_table[(byte >> 4u) & 0xF];

    return crc;
}

uint16_t ModBusCrc16(uint16_t seed, const volatile void *p_data, uint32_t size)
{
    uint8_t *p_block = (uint8_t *)p_data;

    while (size != 0)
    {
        seed = ModBusCrc16_byte(seed, *p_block);
        p_block++;
        size--;
    }
    return seed;
}
//---------------- CRC16 ----------------------------------
unsigned short CRC16_ModBus(unsigned char *data, unsigned int datalen)
{
    unsigned short wCRCin = 0xFFFF;
    unsigned short wCPoly = 0x8005;
    unsigned char wChar = 0;

    while (datalen--)
    {
        wChar = *(data++);
        InvertUint8(&wChar, &wChar);
        wCRCin ^= (wChar << 8);
        for (int i = 0; i < 8; i++)
        {
            if (wCRCin & 0x8000)
                wCRCin = (wCRCin << 1) ^ wCPoly;
            else
                wCRCin = wCRCin << 1;
        }
    }
    InvertUint16(&wCRCin, &wCRCin);
    return (wCRCin);
}
// unsigned short CRC16_MODBUS(unsigned char *data, unsigned int datalen)
// {
// 	unsigned short wCRCin = 0xFFFF;
// 	unsigned short wCPoly = 0x8005;

// 	InvertUint16(&wCPoly,&wCPoly);
// 	while (datalen--)
// 	{
// 		wCRCin ^= *(data++);
// 		for(int i = 0;i < 8;i++)
// 		{
// 			if(wCRCin & 0x01)
// 				wCRCin = (wCRCin >> 1) ^ wCPoly;
// 			else
// 				wCRCin = wCRCin >> 1;
// 		}
// 	}
// 	return (wCRCin);
// }
/**
 * @brief like modbus
 * @param  data             MyParamDoc
 * @param  offset           MyParamDoc
 * @param  len              MyParamDoc
 * @param  preval           MyParamDoc
 * @return uint16_t
 */
uint16_t calcCrc16(uint8_t *data, int32_t offset, int32_t len, uint16_t preval)
{
    uint16_t crc = preval;
    int32_t i, j;

    for (j = 0; j < len; j++)
    {
        crc ^= (uint8_t)data[offset + j];
        for (i = 0; i < 8; i++)
        {
            if (crc & 0x0001)
            {
                crc >>= 1;
                crc ^= 0xa001;
            }
            else
            {
                crc >>= 1;
            }
        }
    }
    return crc;
}